Coal-oil lamp



J; RIDGE Lamp Burner.

Patented April 15, 1862.

' UNITED STAT Z I2A 'IENT OFFICE.

JOSEPH RIDGE, OF RICHMOND, INDIANA.

\ COAL-OIL LAMP.

Specification forming part of Letters Patent No. 34,984, dated April 15, 1862,; Reissued February 4, 1868, No. 2,855.

To all whom it may concern.

Be it known that I, JOSEPH Rinon, of Richmond, in the county of \Vayne and State of Indiana, have invented a new and useful Improvement in Coal-Oil Lamps; and I do hereby declare that the following is a full, clear, and exact description of the construction and operation of the same, reference being had to the annexed drawing, making a part of this specification, in which- Figure 1 is a perspective view, and Fig. 2 is a. view of the diaphragm.

To enable others skilled in the art to make and use my invention, I will proceed to describe its construction and operation.

Fig. 1 is constructed with a short chimney O, a concavo-convex diaphragm D, a wick tube w, and a mechanical device I all secured to any formed vessel containing coal oil; altogether constituting a coal oil lamp, with my improvement attached.

M, Fig. 1, shows a device, the form of which resembles a truncated cone. Its base is made of metal perforated with holes 11, h, h, 72, for the admission of air. To the periphery of base plate is attached a vertical metal rim B, about a quarter of an inch wide. Within the rim B, and reamed to the base, are three studs, or posts, extending upward about an inch, supporting a metal rim 7). The space between these two metal rims B, and b. is inclosed with mica, or with any other substance that will transmit light; the purpose of which is to secure all the light that can be obtained from the flame, beneath the diaphragm D. The upper rim 6, is shouldered on its inner surface to a depth suflicient to receive the diaphragm D, and also the flanged base of chimney O, which is secured in position by means of pin 7), and spring 5, or in any of the ordinary ways. The wick tube w, is in the usual position, but extends upward to within a short distance of the base of chimney O.

D, Fig. 2, represents the diaphragm, which is composed of a narrow metal rim, and two pieces of mica. This rim Z is made with a recess in its inner edge for the pur- [Fmsr PRINTED 1912.]

pose of retaining in position, the mica, which is inserted in two thin pieces, or halves. The convexity is obtained by cutting the halves larger than the inner edge of rim 71:, so that when they are placed in the rim they will bow upward, giving to this partof the diaphragm a concavo-convex form. From each of these two pieces of mica is removed equal portions, forming the slot m, for the passage of the flame. This diaphragm may be made entirely of glass,

or any transparent substance; or may be made of a metallic substance susceptible of a high polish, which, being concave on the under side, would act as a reflector, thereby intensifying the light. By this combined arrangement of the device M, diaphram D, and short chimney C, more light is obtained than from any other lamp. This combination dispenses entirely with a long chimney; in fact, a long chimney produces too strong a draft; as is proved by experiment.

The Wick, in this lamp, is not required to be adjusted so far above the wick tube, as in ordinary lamps; thereby saving oil, and producing as much light.

The diaphragm D, being in position, as indicated in Fig. 1, the chimney O, being placed on the rim of diaphragm, and secured as described; and the whole, as shown by Fig. 1, screwed fast to any of the ordinary oil lamps, the lamp is ready to be used.

What I claim as my invention, and desire to secure by Letters Patent, is

l. The mechanical device M, constructed substantially in the manner and for the purpose herein set forth.

2. I claim the diaphragm D, made and applied as described.

3. I claim the combination of the device M, diaphragln D, and short chimney C, con structed and arranged substantially in the manner shown in Fig. 1, and for the purpose herein described.

JOSEPH RIDGE.

Attest:

A. N. NEWTON, JOHN Fr LnY, 

